When you add ammonia to a solution it is important to remember that you change the concentration of the hydroxide ions present due to the reaction:
NH 3 (aq) + H 2 O (l) NH 4 + (aq) + OH - (aq)
Remembering this will help you with at least two of the steps in this exercise.
In many metal-containing solutions, the addition of ammonia causes a hydroxide precipitate to form. Select the statement below which best describes this observation.

Question

When you add ammonia to a solution it is important to remember that  you change the concentration of the hydroxide ions  present due to the reaction: 
 NH 3  (aq) + H 2 O (l)  NH 4 +  (aq) +  OH -  (aq) 
 Remembering this will help you with at least two of the steps in this exercise. 
 In many metal-containing solutions, the addition of ammonia causes a hydroxide precipitate to form.  Select the statement below which best describes this observation.

Accepted Answer

The addition of NH 3  results in a reaction between ammonia and water, causing [OH - ] to increase.

Answer

The addition of NH 3   results in a reaction between ammonia and OH - , causing the pH to increase.

Answer

The addition of NH 3  causes the pH to decrease thus increasing the [OH - ].

Answer

The addition of NH 3  causes the pH to increase thus increasing the [OH - ].

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